/* * pppd-private.h - PPP daemon private declarations. * * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef PPP_PPPD_PRIVATE_H #define PPP_PPPD_PRIVATE_H #include /* for FILE */ #include /* for encrypt */ #include /* for setkey */ #if defined(__linux__) #include #else #include #endif #include "pppd.h" #ifdef PPP_WITH_IPV6CP #include "eui64.h" #endif /* * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name. * Where should PPP_DRV_NAME come from? Do we include it here? */ #if !defined(PPP_DRV_NAME) #if defined(SOL2) #define PPP_DRV_NAME "sppp" #else #define PPP_DRV_NAME "ppp" #endif /* defined(SOL2) */ #endif /* !defined(PPP_DRV_NAME) */ #ifndef GIDSET_TYPE #define GIDSET_TYPE gid_t #endif /* Structure representing a list of permitted IP addresses. */ struct permitted_ip { int permit; /* 1 = permit, 0 = forbid */ u_int32_t base; /* match if (addr & mask) == base */ u_int32_t mask; /* base and mask are in network byte order */ }; struct notifier { struct notifier *next; ppp_notify_fn *func; void *arg; }; /* * Global variables. */ extern int hungup; /* Physical layer has disconnected */ extern int ifunit; /* Interface unit number */ extern char ifname[]; /* Interface name (IFNAMSIZ) */ extern char hostname[]; /* Our hostname */ extern unsigned char outpacket_buf[]; /* Buffer for outgoing packets */ extern int devfd; /* fd of underlying device */ extern int fd_ppp; /* fd for talking PPP */ extern int baud_rate; /* Current link speed in bits/sec */ extern char *progname; /* Name of this program */ extern int redirect_stderr;/* Connector's stderr should go to file */ extern char peer_authname[];/* Authenticated name of peer */ extern int auth_done[NUM_PPP]; /* Methods actually used for auth */ extern int privileged; /* We were run by real-uid root */ extern int need_holdoff; /* Need holdoff period after link terminates */ extern char **script_env; /* Environment variables for scripts */ extern int detached; /* Have detached from controlling tty */ extern GIDSET_TYPE groups[]; /* groups the user is in */ extern int ngroups; /* How many groups valid in groups */ extern int link_stats_valid; /* set if link_stats is valid */ extern int link_stats_print; /* set if link_stats is to be printed on link termination */ extern int log_to_fd; /* logging to this fd as well as syslog */ extern bool log_default; /* log_to_fd is default (stdout) */ extern char *no_ppp_msg; /* message to print if ppp not in kernel */ extern bool devnam_fixed; /* can no longer change devnam */ extern int unsuccess; /* # unsuccessful connection attempts */ extern int do_callback; /* set if we want to do callback next */ extern int doing_callback; /* set if this is a callback */ extern int error_count; /* # of times error() has been called */ extern char ppp_devname[]; /* name of PPP tty (maybe ttypx) */ extern int fd_devnull; /* fd open to /dev/null */ extern int listen_time; /* time to listen first (ms) */ extern bool bundle_eof; extern bool bundle_terminating; extern struct notifier *pidchange; /* for notifications of pid changing */ extern struct notifier *phasechange; /* for notifications of phase changes */ extern struct notifier *exitnotify; /* for notification that we're exiting */ extern struct notifier *sigreceived; /* notification of received signal */ extern struct notifier *ip_up_notifier; /* IPCP has come up */ extern struct notifier *ip_down_notifier; /* IPCP has gone down */ extern struct notifier *ipv6_up_notifier; /* IPV6CP has come up */ extern struct notifier *ipv6_down_notifier; /* IPV6CP has gone down */ extern struct notifier *auth_up_notifier; /* peer has authenticated */ extern struct notifier *link_down_notifier; /* link has gone down */ extern struct notifier *fork_notifier; /* we are a new child process */ /* Values for do_callback and doing_callback */ #define CALLBACK_DIALIN 1 /* we are expecting the call back */ #define CALLBACK_DIALOUT 2 /* we are dialling out to call back */ /* * Variables set by command-line options. */ extern int debug; /* Debug flag */ extern int kdebugflag; /* Tell kernel to print debug messages */ extern int default_device; /* Using /dev/tty or equivalent */ extern char devnam[]; /* Device name */ extern char remote_number[MAXNAMELEN]; /* Remote telephone number, if avail. */ extern int ppp_session_number; /* Session number (eg PPPoE session) */ extern int crtscts; /* Use hardware flow control */ extern int stop_bits; /* Number of serial port stop bits */ extern bool modem; /* Use modem control lines */ extern int inspeed; /* Input/Output speed requested */ extern u_int32_t netmask; /* IP netmask to set on interface */ extern bool lockflag; /* Create lock file to lock the serial dev */ extern bool nodetach; /* Don't detach from controlling tty */ #ifdef SYSTEMD extern bool up_sdnotify; /* Notify systemd once link is up (implies nodetach) */ #endif extern bool updetach; /* Detach from controlling tty when link up */ extern bool master_detach; /* Detach when multilink master without link (options.c) */ extern char *initializer; /* Script to initialize physical link */ extern char *connect_script; /* Script to establish physical link */ extern char *disconnect_script; /* Script to disestablish physical link */ extern char *welcomer; /* Script to welcome client after connection */ extern char *ptycommand; /* Command to run on other side of pty */ extern char user[MAXNAMELEN];/* Our name for authenticating ourselves */ extern char passwd[MAXSECRETLEN]; /* Password for PAP or CHAP */ extern bool auth_required; /* Peer is required to authenticate */ extern bool persist; /* Reopen link after it goes down */ extern bool uselogin; /* Use /etc/passwd for checking PAP */ extern bool session_mgmt; /* Do session management (login records) */ extern char our_name[MAXNAMELEN];/* Our name for authentication purposes */ extern char remote_name[MAXNAMELEN]; /* Peer's name for authentication */ extern char path_upapfile[];/* Pathname of pap-secrets file */ extern char path_chapfile[];/* Pathname of chap-secrets file */ extern bool explicit_remote;/* remote_name specified with remotename opt */ extern bool demand; /* Do dial-on-demand */ extern char *ipparam; /* Extra parameter for ip up/down scripts */ extern bool cryptpap; /* Others' PAP passwords are encrypted */ extern int holdoff; /* Dead time before restarting */ extern bool holdoff_specified; /* true if user gave a holdoff value */ extern bool notty; /* Stdin/out is not a tty */ extern char *pty_socket; /* Socket to connect to pty */ extern char *record_file; /* File to record chars sent/received */ extern int maxfail; /* Max # of unsuccessful connection attempts */ extern char linkname[]; /* logical name for link */ extern bool tune_kernel; /* May alter kernel settings as necessary */ extern int connect_delay; /* Time to delay after connect script */ extern int max_data_rate; /* max bytes/sec through charshunt */ extern int req_unit; /* interface unit number to use */ extern char path_net_init[]; /* pathname of net-init script */ extern char path_net_preup[];/* pathname of net-pre-up script */ extern char path_net_down[]; /* pathname of net-down script */ extern char path_ipup[]; /* pathname of ip-up script */ extern char path_ipdown[]; /* pathname of ip-down script */ extern char path_ippreup[]; /* pathname of ip-pre-up script */ extern char req_ifname[]; /* interface name to use (IFNAMSIZ) */ extern bool multilink; /* enable multilink operation (options.c) */ extern bool noendpoint; /* don't send or accept endpt. discrim. */ extern char *bundle_name; /* bundle name for multilink */ extern bool dump_options; /* print out option values */ extern bool show_options; /* show all option names and descriptions */ extern bool dryrun; /* check everything, print options, exit */ extern int child_wait; /* # seconds to wait for children at end */ extern char *current_option; /* the name of the option being parsed */ extern int privileged_option; /* set iff the current option came from root */ extern char *option_source; /* string saying where the option came from */ extern int option_priority; /* priority of current options */ #ifdef PPP_WITH_IPV6CP extern char path_ipv6up[]; /* pathname of ipv6-up script */ extern char path_ipv6down[]; /* pathname of ipv6-down script */ #endif #if defined(PPP_WITH_EAPTLS) || defined(PPP_WITH_PEAP) #define TLS_VERIFY_NONE "none" #define TLS_VERIFY_NAME "name" #define TLS_VERIFY_SUBJECT "subject" #define TLS_VERIFY_SUFFIX "suffix" extern char *crl_dir; extern char *crl_file; extern char *ca_path; extern char *cacert_file; extern char *max_tls_version; extern bool tls_verify_key_usage; extern char *tls_verify_method; #endif /* PPP_WITH_EAPTLS || PPP_WITH_PEAP */ #ifdef PPP_WITH_EAPTLS extern char *pkcs12_file; #endif /* PPP_WITH_EAPTLS */ typedef enum { PPP_OCTETS_DIRECTION_SUM, PPP_OCTETS_DIRECTION_IN, PPP_OCTETS_DIRECTION_OUT, PPP_OCTETS_DIRECTION_MAXOVERAL, PPP_OCTETS_DIRECTION_MAXSESSION /* Same as MAXOVERALL, but a little different for RADIUS */ } session_limit_dir_t; extern unsigned int maxoctets; /* Maximum octetes per session (in bytes) */ extern session_limit_dir_t maxoctets_dir; /* Direction */ extern int maxoctets_timeout; /* Timeout for check of octets limit */ #ifdef PPP_WITH_FILTER /* Filter for pkts to pass */ extern struct bpf_program pass_filter_in; extern struct bpf_program pass_filter_out; /* Filter for link-active pkts */ extern struct bpf_program active_filter_in; extern struct bpf_program active_filter_out; #endif #ifdef PPP_WITH_MSLANMAN extern bool ms_lanman; /* Use LanMan password instead of NT */ /* Has meaning only with MS-CHAP challenges */ #endif /* Values for auth_pending, auth_done */ #define PAP_WITHPEER 0x1 #define PAP_PEER 0x2 #define CHAP_WITHPEER 0x4 #define CHAP_PEER 0x8 #define EAP_WITHPEER 0x10 #define EAP_PEER 0x20 /* Values for auth_done only */ #define CHAP_MD5_WITHPEER 0x40 #define CHAP_MD5_PEER 0x80 #define CHAP_MS_SHIFT 8 /* LSB position for MS auths */ #define CHAP_MS_WITHPEER 0x100 #define CHAP_MS_PEER 0x200 #define CHAP_MS2_WITHPEER 0x400 #define CHAP_MS2_PEER 0x800 /* * This structure contains environment variables that are set or unset * by the user. */ struct userenv { struct userenv *ue_next; char *ue_value; /* value (set only) */ bool ue_isset; /* 1 for set, 0 for unset */ bool ue_priv; /* from privileged source */ const char *ue_source; /* source name */ char ue_name[1]; /* variable name */ }; extern struct userenv *userenv_list; /* * Prototypes. */ /* Procedures exported from main.c. */ void set_ifunit(int); /* set stuff that depends on ifunit */ void detach(void); /* Detach from controlling tty */ void die(int); /* Cleanup and exit */ void quit(void); /* like die(1) */ void record_child(int, char *, void (*) (void *), void *, int); int device_script(char *cmd, int in, int out, int dont_wait); /* Run `cmd' with given stdin and stdout */ pid_t run_program(char *prog, char * const * args, int must_exist, void (*done)(void *), void *arg, int wait); /* Run program prog with args in child */ void reopen_log(void); /* (re)open the connection to syslog */ void print_link_stats(void); /* Print stats, if available */ void reset_link_stats(int); /* Reset (init) stats when link goes up */ void new_phase(ppp_phase_t); /* signal start of new phase */ bool in_phase(ppp_phase_t); void notify(struct notifier *, int); int ppp_send_config(int, int, u_int32_t, int, int); int ppp_recv_config(int, int, u_int32_t, int, int); const char *protocol_name(int); void remove_pidfiles(void); void lock_db(void); void unlock_db(void); /* Procedures exported from tty.c. */ void tty_init(void); void print_string(char *, int, printer_func, void *); /* Format a string for output */ ssize_t complete_read(int, void *, size_t); /* read a complete buffer */ /* Procedures exported from auth.c */ void link_required(int); /* we are starting to use the link */ void start_link(int); /* bring the link up now */ void link_terminated(int); /* we are finished with the link */ void link_down(int); /* the LCP layer has left the Opened state */ void upper_layers_down(int);/* take all NCPs down */ void link_established(int); /* the link is up; authenticate now */ void start_networks(int); /* start all the network control protos */ void continue_networks(int); /* start network [ip, etc] control protos */ void np_up(int, int); /* a network protocol has come up */ void np_down(int, int); /* a network protocol has gone down */ void np_finished(int, int); /* a network protocol no longer needs link */ void auth_peer_fail(int, int); /* peer failed to authenticate itself */ void auth_peer_success(int, int, int, char *, int); /* peer successfully authenticated itself */ void auth_withpeer_fail(int, int); /* we failed to authenticate ourselves */ void auth_withpeer_success(int, int, int); /* we successfully authenticated ourselves */ void auth_check_options(void); /* check authentication options supplied */ void auth_reset(int); /* check what secrets we have */ int check_passwd(int, char *, int, char *, int, char **); /* Check peer-supplied username/password */ int get_secret(int, char *, char *, char *, int *, int); /* get "secret" for chap */ int get_srp_secret(int unit, char *client, char *server, char *secret, int am_server); int auth_ip_addr(int, u_int32_t); /* check if IP address is authorized */ int auth_number(void); /* check if remote number is authorized */ /* Procedures exported from demand.c */ void demand_conf(void); /* config interface(s) for demand-dial */ void demand_block(void); /* set all NPs to queue up packets */ void demand_unblock(void); /* set all NPs to pass packets */ void demand_discard(void); /* set all NPs to discard packets */ void demand_rexmit(int); /* retransmit saved frames for an NP */ int loop_chars(unsigned char *, int); /* process chars from loopback */ int loop_frame(unsigned char *, int); /* should we bring link up? */ /* Procedures exported from sys-*.c */ void sys_init(void); /* Do system-dependent initialization */ void sys_cleanup(void); /* Restore system state before exiting */ int sys_check_options(void); /* Check options specified */ int get_pty(int *, int *, char *, int); /* Get pty master/slave */ int open_ppp_loopback(void); /* Open loopback for demand-dialling */ int tty_establish_ppp(int); /* Turn serial port into a ppp interface */ void tty_disestablish_ppp(int); /* Restore port to normal operation */ void make_new_bundle(int, int, int, int); /* Create new bundle */ int bundle_attach(int); /* Attach link to existing bundle */ void cfg_bundle(int, int, int, int); /* Configure existing bundle */ void destroy_bundle(void); /* Tell driver to destroy bundle */ void clean_check(void); /* Check if line was 8-bit clean */ void set_up_tty(int, int); /* Set up port's speed, parameters, etc. */ void restore_tty(int); /* Restore port's original parameters */ void setdtr(int, int); /* Raise or lower port's DTR line */ void output(int, unsigned char *, int); /* Output a PPP packet */ void wait_input(struct timeval *); /* Wait for input, with timeout */ void add_fd(int); /* Add fd to set to wait for */ void remove_fd(int); /* Remove fd from set to wait for */ int read_packet(unsigned char *); /* Read PPP packet */ int get_loop_output(void); /* Read pkts from loopback */ void tty_send_config(int, u_int32_t, int, int); /* Configure i/f transmit parameters */ void tty_set_xaccm(ext_accm); /* Set extended transmit ACCM */ void tty_recv_config(int, u_int32_t, int, int); /* Configure i/f receive parameters */ int ccp_test(int, unsigned char *, int, int); /* Test support for compression scheme */ void ccp_flags_set(int, int, int); /* Set kernel CCP state */ int ccp_fatal_error(int); /* Test for fatal decomp error in kernel */ int get_idle_time(int, struct ppp_idle *); /* Find out how long link has been idle */ int get_ppp_stats(int, struct pppd_stats *); /* Return link statistics */ int sifvjcomp(int, int, int, int); /* Configure VJ TCP header compression */ int sifup(int); /* Configure i/f up for one protocol */ int sifnpmode(int u, int proto, enum NPmode mode); /* Set mode for handling packets for proto */ int sifdown(int); /* Configure i/f down for one protocol */ int sifaddr(int, u_int32_t, u_int32_t, u_int32_t); /* Configure IPv4 addresses for i/f */ int cifaddr(int, u_int32_t, u_int32_t); /* Reset i/f IP addresses */ #ifdef PPP_WITH_IPV6CP int sif6up(int); /* Configure i/f up for IPv6 */ int sif6down(int); /* Configure i/f down for IPv6 */ int sif6addr(int, eui64_t, eui64_t); /* Configure IPv6 addresses for i/f */ int cif6addr(int, eui64_t, eui64_t); /* Remove an IPv6 address from i/f */ #endif int sifdefaultroute(int, u_int32_t, u_int32_t, bool replace_default_rt); /* Create default route through i/f */ int cifdefaultroute(int, u_int32_t, u_int32_t); /* Delete default route through i/f */ #ifdef PPP_WITH_IPV6CP int sif6defaultroute(int, eui64_t, eui64_t); /* Create default IPv6 route through i/f */ int cif6defaultroute(int, eui64_t, eui64_t); /* Delete default IPv6 route through i/f */ #endif int sifproxyarp(int, u_int32_t); /* Add proxy ARP entry for peer */ int cifproxyarp(int, u_int32_t); /* Delete proxy ARP entry for peer */ u_int32_t GetMask(u_int32_t); /* Get appropriate netmask for address */ int mkdir_recursive(const char *); /* Recursively create directory */ int lock(char *); /* Create lock file for device */ int relock(int); /* Rewrite lock file with new pid */ void unlock(void); /* Delete previously-created lock file */ void logwtmp(const char *, const char *, const char *); /* Write entry to wtmp file */ int get_host_seed(void); /* Get host-dependent random number seed */ int have_route_to(u_int32_t); /* Check if route to addr exists */ #ifdef PPP_WITH_FILTER int set_filters(struct bpf_program *pass_in, struct bpf_program *pass_out, struct bpf_program *active_in, struct bpf_program *active_out); /* Set filter programs in kernel */ #endif int get_if_hwaddr(unsigned char *addr, char *name); int get_first_ether_hwaddr(unsigned char *addr); /* Procedures exported from options.c */ int setipaddr(char *, char **, int); /* Set local/remote ip addresses */ int parse_args(int argc, char **argv); /* Parse options from arguments given */ int getword(FILE *f, char *word, int *newlinep, char *filename); /* Read a word from a file */ int options_from_user(void); /* Parse options from user's .ppprc */ int options_for_tty(void); /* Parse options from /etc/ppp/options.tty */ struct wordlist; int options_from_list(struct wordlist *, int privileged); /* Parse options from a wordlist */ void check_options(void); /* check values after all options parsed */ int override_value(char *, int, const char *); /* override value if permitted by priority */ void print_options(printer_func, void *); /* print out values of all options */ void showopts(void); /* show all option names and description */ int parse_dotted_ip(char *, u_int32_t *); /* * Inline versions of get/put char/short/long. * Pointer is advanced; we assume that both arguments * are lvalues and will already be in registers. * cp MUST be unsigned char *. */ #define GETCHAR(c, cp) { \ (c) = *(cp)++; \ } #define PUTCHAR(c, cp) { \ *(cp)++ = (unsigned char) (c); \ } #define GETSHORT(s, cp) { \ (s) = *(cp)++ << 8; \ (s) |= *(cp)++; \ } #define PUTSHORT(s, cp) { \ *(cp)++ = (unsigned char) ((s) >> 8); \ *(cp)++ = (unsigned char) (s); \ } #define GETLONG(l, cp) { \ (l) = *(cp)++ << 8; \ (l) |= *(cp)++; (l) <<= 8; \ (l) |= *(cp)++; (l) <<= 8; \ (l) |= *(cp)++; \ } #define PUTLONG(l, cp) { \ *(cp)++ = (unsigned char) ((l) >> 24); \ *(cp)++ = (unsigned char) ((l) >> 16); \ *(cp)++ = (unsigned char) ((l) >> 8); \ *(cp)++ = (unsigned char) (l); \ } #define INCPTR(n, cp) ((cp) += (n)) #define DECPTR(n, cp) ((cp) -= (n)) /* * System dependent definitions for user-level 4.3BSD UNIX implementation. */ #define TIMEOUT(r, f, t) ppp_timeout((r), (f), (t), 0) #define UNTIMEOUT(r, f) ppp_untimeout((r), (f)) #define BCOPY(s, d, l) memcpy(d, s, l) #define BZERO(s, n) memset(s, 0, n) #define BCMP(s1, s2, l) memcmp(s1, s2, l) #define PRINTMSG(m, l) { info("Remote message: %0.*v", l, m); } /* * MAKEHEADER - Add Header fields to a packet. */ #define MAKEHEADER(p, t) { \ PUTCHAR(PPP_ALLSTATIONS, p); \ PUTCHAR(PPP_UI, p); \ PUTSHORT(t, p); } /* * Debug macros. Slightly useful for finding bugs in pppd, not particularly * useful for finding out why your connection isn't being established. */ #ifdef DEBUGALL #define DEBUGMAIN 1 #define DEBUGFSM 1 #define DEBUGLCP 1 #define DEBUGIPCP 1 #define DEBUGIPV6CP 1 #define DEBUGUPAP 1 #define DEBUGCHAP 1 #endif #ifndef LOG_PPP /* we use LOG_LOCAL2 for syslog by default */ #if defined(DEBUGMAIN) || defined(DEBUGFSM) || defined(DEBUGSYS) \ || defined(DEBUGLCP) || defined(DEBUGIPCP) || defined(DEBUGUPAP) \ || defined(DEBUGCHAP) || defined(DEBUG) || defined(DEBUGIPV6CP) #define LOG_PPP LOG_LOCAL2 #else #define LOG_PPP LOG_DAEMON #endif #endif /* LOG_PPP */ #ifdef DEBUGMAIN #define MAINDEBUG(x) if (debug) dbglog x #else #define MAINDEBUG(x) #endif #ifdef DEBUGSYS #define SYSDEBUG(x) if (debug) dbglog x #else #define SYSDEBUG(x) #endif #ifdef DEBUGFSM #define FSMDEBUG(x) if (debug) dbglog x #else #define FSMDEBUG(x) #endif #ifdef DEBUGLCP #define LCPDEBUG(x) if (debug) dbglog x #else #define LCPDEBUG(x) #endif #ifdef DEBUGIPCP #define IPCPDEBUG(x) if (debug) dbglog x #else #define IPCPDEBUG(x) #endif #ifdef DEBUGIPV6CP #define IPV6CPDEBUG(x) if (debug) dbglog x #else #define IPV6CPDEBUG(x) #endif #ifdef DEBUGUPAP #define UPAPDEBUG(x) if (debug) dbglog x #else #define UPAPDEBUG(x) #endif #ifdef DEBUGCHAP #define CHAPDEBUG(x) if (debug) dbglog x #else #define CHAPDEBUG(x) #endif #ifndef SIGTYPE #if defined(sun) || defined(SYSV) || defined(POSIX_SOURCE) #define SIGTYPE void #else #define SIGTYPE int #endif /* defined(sun) || defined(SYSV) || defined(POSIX_SOURCE) */ #endif /* SIGTYPE */ #ifndef MIN #define MIN(a, b) ((a) < (b)? (a): (b)) #endif #ifndef MAX #define MAX(a, b) ((a) > (b)? (a): (b)) #endif #ifndef offsetof #define offsetof(type, member) ((size_t) &((type *)0)->member) #endif #endif